Seriously - High School Musical

Ok, I'll be the first to admit that I have NO IDEA what this whole High School Musical thing is all about....but did I just hear correctly that there's a character in that show called Sharpay?

I thought this was a sharpei

....I'm really confused....so I guess Ashley Tisdale (ok, I just googled it) doesn't mind playing a character named after a dog.....so is she a bitch on the show? I don't know I've never seen it.